1 files changed, 270 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/core/subdev/bios/shadow.c b/drivers/gpu/drm/nouveau/core/subdev/bios/shadow.c
new file mode 100644
index 000000000000..bb9e0018d936
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/core/subdev/bios/shadow.c
@@ -0,0 +1,270 @@
+/*
+ * Copyright 2014 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs <bskeggs@redhat.com>
+ */
+
+#include "priv.h"
+#include <core/option.h>
+#include <subdev/bios/image.h>
+
+struct shadow {
+	struct nouveau_oclass base;
+	u32 skip;
+	const struct nvbios_source *func;
+	void *data;
+	u32 size;
+	int score;
+};
+
+static bool
+shadow_fetch(struct nouveau_bios *bios, u32 upto)
+{
+	struct shadow *mthd = (void *)nv_object(bios)->oclass;
+	const u32 limit = (upto + 3) & ~3;
+	const u32 start = bios->size;
+	void *data = mthd->data;
+	if (nvbios_extend(bios, limit) > 0) {
+		u32 read = mthd->func->read(data, start, limit - start, bios);
+		bios->size = start + read;
+	}
+	return bios->size >= limit;
+}
+
+static u8
+shadow_rd08(struct nouveau_object *object, u64 addr)
+{
+	struct nouveau_bios *bios = (void *)object;
+	if (shadow_fetch(bios, addr + 1))
+		return bios->data[addr];
+	return 0x00;
+}
+
+static u16
+shadow_rd16(struct nouveau_object *object, u64 addr)
+{
+	struct nouveau_bios *bios = (void *)object;
+	if (shadow_fetch(bios, addr + 2))
+		return get_unaligned_le16(&bios->data[addr]);
+	return 0x0000;
+}
+
+static u32
+shadow_rd32(struct nouveau_object *object, u64 addr)
+{
+	struct nouveau_bios *bios = (void *)object;
+	if (shadow_fetch(bios, addr + 4))
+		return get_unaligned_le32(&bios->data[addr]);
+	return 0x00000000;
+}
+
+static struct nouveau_oclass
+shadow_class = {
+	.handle = NV_SUBDEV(VBIOS, 0x00),
+	.ofuncs = &(struct nouveau_ofuncs) {
+		.rd08 = shadow_rd08,
+		.rd16 = shadow_rd16,
+		.rd32 = shadow_rd32,
+	},
+};
+
+static int
+shadow_image(struct nouveau_bios *bios, int idx, struct shadow *mthd)
+{
+	struct nvbios_image image;
+	int score = 1;
+
+	if (!nvbios_image(bios, idx, &image)) {
+		nv_debug(bios, "image %d invalid\n", idx);
+		return 0;
+	}
+	nv_debug(bios, "%08x: type %02x, %d bytes\n",
+		 image.base, image.type, image.size);
+
+	if (!shadow_fetch(bios, image.size)) {
+		nv_debug(bios, "%08x: fetch failed\n", image.base);
+		return 0;
+	}
+
+	switch (image.type) {
+	case 0x00:
+		if (nvbios_checksum(&bios->data[image.base], image.size)) {
+			nv_debug(bios, "%08x: checksum failed\n", image.base);
+			if (mthd->func->rw)
+				score += 1;
+			score += 1;
+		} else {
+			score += 3;
+		}
+		break;
+	default:
+		score += 3;
+		break;
+	}
+
+	if (!image.last)
+		score += shadow_image(bios, idx + 1, mthd);
+	return score;
+}
+
+static int
+shadow_score(struct nouveau_bios *bios, struct shadow *mthd)
+{
+	struct nouveau_oclass *oclass = nv_object(bios)->oclass;
+	int score;
+	nv_object(bios)->oclass = &mthd->base;
+	score = shadow_image(bios, 0, mthd);
+	nv_object(bios)->oclass = oclass;
+	return score;
+
+}
+
+static int
+shadow_method(struct nouveau_bios *bios, struct shadow *mthd, const char *name)
+{
+	const struct nvbios_source *func = mthd->func;
+	if (func->name) {
+		nv_debug(bios, "trying %s...\n", name ? name : func->name);
+		if (func->init) {
+			mthd->data = func->init(bios, name);
+			if (IS_ERR(mthd->data)) {
+				mthd->data = NULL;
+				return 0;
+			}
+		}
+		mthd->score = shadow_score(bios, mthd);
+		if (func->fini)
+			func->fini(mthd->data);
+		nv_debug(bios, "scored %d\n", mthd->score);
+		mthd->data = bios->data;
+		mthd->size = bios->size;
+		bios->data  = NULL;
+		bios->size  = 0;
+	}
+	return mthd->score;
+}
+
+static u32
+shadow_fw_read(void *data, u32 offset, u32 length, struct nouveau_bios *bios)
+{
+	const struct firmware *fw = data;
+	if (offset + length <= fw->size) {
+		memcpy(bios->data + offset, fw->data + offset, length);
+		return length;
+	}
+	return 0;
+}
+
+static void *
+shadow_fw_init(struct nouveau_bios *bios, const char *name)
+{
+	struct device *dev = &nv_device(bios)->pdev->dev;
+	const struct firmware *fw;
+	int ret = request_firmware(&fw, name, dev);
+	if (ret)
+		return ERR_PTR(-ENOENT);
+	return (void *)fw;
+}
+
+static const struct nvbios_source
+shadow_fw = {
+	.name = "firmware",
+	.init = shadow_fw_init,
+	.fini = (void(*)(void *))release_firmware,
+	.read = shadow_fw_read,
+	.rw = false,
+};
+
+int
+nvbios_shadow(struct nouveau_bios *bios)
+{
+	struct shadow mthds[] = {
+		{ shadow_class, 0, &nvbios_of },
+		{ shadow_class, 0, &nvbios_ramin },
+		{ shadow_class, 0, &nvbios_rom },
+		{ shadow_class, 0, &nvbios_acpi_fast },
+		{ shadow_class, 4, &nvbios_acpi_slow },
+		{ shadow_class, 1, &nvbios_pcirom },
+		{ shadow_class, 1, &nvbios_platform },
+		{ shadow_class }
+	}, *mthd = mthds, *best = NULL;
+	const char *optarg;
+	char *source;
+	int optlen;
+
+	/* handle user-specified bios source */
+	optarg = nouveau_stropt(nv_device(bios)->cfgopt, "NvBios", &optlen);
+	source = optarg ? kstrndup(optarg, optlen, GFP_KERNEL) : NULL;
+	if (source) {
+		/* try to match one of the built-in methods */
+		for (mthd = mthds; mthd->func; mthd++) {
+			if (mthd->func->name &&
+			    !strcasecmp(source, mthd->func->name)) {
+				best = mthd;
+				if (shadow_method(bios, mthd, NULL))
+					break;
+			}
+		}
+
+		/* otherwise, attempt to load as firmware */
+		if (!best && (best = mthd)) {
+			mthd->func = &shadow_fw;
+			shadow_method(bios, mthd, source);
+			mthd->func = NULL;
+		}
+
+		if (!best->score) {
+			nv_error(bios, "%s invalid\n", source);
+			kfree(source);
+			source = NULL;
+		}
+	}
+
+	/* scan all potential bios sources, looking for best image */
+	if (!best || !best->score) {
+		for (mthd = mthds, best = mthd; mthd->func; mthd++) {
+			if (!mthd->skip || best->score < mthd->skip) {
+				if (shadow_method(bios, mthd, NULL)) {
+					if (mthd->score > best->score)
+						best = mthd;
+				}
+			}
+		}
+	}
+
+	/* cleanup the ones we didn't use */
+	for (mthd = mthds; mthd->func; mthd++) {
+		if (mthd != best)
+			kfree(mthd->data);
+	}
+
+	if (!best->score) {
+		nv_fatal(bios, "unable to locate usable image\n");
+		return -EINVAL;
+	}
+
+	nv_info(bios, "using image from %s\n", best->func ?
+		best->func->name : source);
+	bios->data = best->data;
+	bios->size = best->size;
+	kfree(source);
+	return 0;
+}